Fixes https://github.com/samsarahq/thunder/issues/504

[JonasGutermuth]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 3498

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.04%) to 65.779%

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Files with Coverage Reduction	New Missed Lines	%
graphql/schemabuilder/input.go	2	60.98%

Totals
Change from base Build 3490:	0.04%
Covered Lines:	6051
Relevant Lines:	9199

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💛 - Coveralls

[KevinXing]

Thanks for the fixing!